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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7954b4287b0ff123ad063cb8b2e60d0a067daad3829d11c2e2b67f4b208efcb' 
  AND token = '7K7jTCnWnxuJ88hdYEhe1J7BEoEq+s2n1PJXLlVTkm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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