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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e67ddd2aa8cd9b26892d4fdc050559c37433889f334c94d3aed6e38443c42e4' 
  AND token = 'ofufymvVHhJPwsItw/4FQZ2EoPEZwCBuBICh0GcTNSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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