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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ec470d311e4d7c93c65889ed88bf24e83b715e723cf04f60bde5ad78ad7e48' 
  AND token = 'IKESBPDG/SjHjyTXmgGr6WoBAktqcaUFpgYDWxkDzNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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