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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2896af4c9540d9fa4bf19248e695ea0a7aabca6a8ca1c64313cef864cd65b7ec' 
  AND token = 'mzz+zQxoSLzssP59QtxgKfeyqaLwMq6sv1mtm2ToCmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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