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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294f3c9142e715e14a5c2a16b46ce5c507376e35ef2a66121d930c95267edf9c' 
  AND token = '5cdgUATSrSMTDVxYHVNpjVpzTvzXcfloZa5iJMPl6Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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