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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6f0c0864678c00b72ef84d9d026eed03acbfae24c1084593ce9fd6b1647135' 
  AND token = 'K6j6lUxqnAhaL4OSkPwNKA/Niv2Gf5BWd2i7nDhSHKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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