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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3748644e699c6657a43814f2bf743d8366fefed6d23fbf572a43c8013261b3f4' 
  AND token = 'srMhK3GxgIy0gLDS9RBtjiskMFawmvIzgjoq4oiji4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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