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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d3f1e733da35bb240ff0c10e8f313df59913722136237b53ad715b3555a4a8' 
  AND token = 'pFww4NEDTNgVYizUw4z3v+B7F6dMnU1KoTL+ndRxJms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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