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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e7b086b086a8c264ee12c205596ae1c3eaaf34042a5eb10805ec16fde744fa' 
  AND token = 'hlWTfMgek7LSxlt1R6IrCKyGGH8xZwlu2p6CxjZkl9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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