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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c238a260250ae2f51353b350f3602ab51521382af9541ae1b76b8a3c21fa25d4' 
  AND token = '7EILBEvYNbfV1d/EzRXHaR+iZ39ZsJ/AX4PB9+zWG3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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