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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd829db1c85010caa943055eb4093c0426e27a0f48fe127bae9d42e74091812' 
  AND token = 'lMT7OntfGoz/b7hmkE017ry113F5oCskan+Qg1zXVXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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