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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca495f5fbff8e255c8cc51f062bb12bd93fa6c051fa7f6c1a221f9b5d52ce34' 
  AND token = 'FuNHRH7rH/pRPCrYoGWLsUaLJcAzp2+cPn9WQlWvh+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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