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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250a6b9428d5d8b4e77e9eefc8bc20131ae31409ad18ab1f057b9287568f296c' 
  AND token = '9RUv2BO2cTnQOal7xTcMC36R5OL1AklPGF4T1dvf2+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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