SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd223bffb8b2cc79e423a5dc5a47111f7de3e9865b994c368d511b73d22970fde' 
  AND token = 'pVPVR5/65zXfj7KxyfaSoyAGq+gR7ghl5CKpGoMJ2Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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