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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608ddd55b3654be5a48c7b05725da51f5ff801375ebef9ca8831e94b6d4bc4fc' 
  AND token = 'm2GKILh9M5VSMv81lSiG8fwvp0pf1fgPdsU9WnLBzQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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