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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2438f0caf3259f6eb1454cc1bd0b86c52d1d87b3a7eea8f694bc56ae4251d7b7' 
  AND token = 'B39DDzNnu2fDaI1h5FSRkwD0eRMPCrnCRoi/q32QqTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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