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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0298fe8cd665d2769e84fb08522e13c327d3066ee500dbc6234c2246f695b9' 
  AND token = 'jg9r28ZjdCL8vwMHlU82X6np8UryEBXQ9EcNp7uYAKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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