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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4f8ae7bd4b5ab92ab57b770b6c76b3aff27b9e47f6ba13e378be91e7c59b8f' 
  AND token = 'uvO6alLZJhHVIa67UfGOfV2/XstdoLSpNA/wUrtfBAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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