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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ef0e38bcef37557e4c4c146da9c56a147eea73b0574be0bbdd310a806f5497' 
  AND token = 'ESfxm7qcRGaxbriVRs3bDJrh1pYVRaHyHV1bXbSQ7dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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