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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9553c68c0ad938958d18139392b9d4bca961c12a2a28a6cd469320fd66709a' 
  AND token = 'dEgnuVFdTKu9f8FakJ0XQhzaHMdMZ8yBWym9KIbZpjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}