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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2f349788694ceac81dc04d532c862b43fc8344d0e215750353394268938bfa' 
  AND token = 'UY66uspTn0Va9MtLYgzJMPIj7if3eVhx2+W0syX1QA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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