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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e51d7ec1d52a86872bb20d91103a10ecfcb9d40f50016c9fc13d02fa5d0874' 
  AND token = 'oS3yQMssehwESrK2BxAFXNXXHBPrDM92N6IDb7XGpqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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