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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcbff301d3aee63a7ea34fc7492b2805812a44c4065715d76592c3c8a71cf73' 
  AND token = 'AXMDaYhFL9RCtY0cpDjIh7eZdPKh3g0awH9K6nGDbZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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