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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad11973cabf404aeff56efeb0e015085a5eee6fe3a956db2a7ba2cb867a9d9ed' 
  AND token = 'qlmDt9IG9q9H66Sz52wlJ1qwKy+2LR4Av6ZWX138wmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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