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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d063f4412a55d4f6c069a9647ac942df8dba1cffa404bac125f8749af3caf66' 
  AND token = 'ZuPUQLPOj7viLEJQs0QzQu8uNe63yaUtLh0vCIP0CcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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