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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ae3f60990505ed131a0b56701aeab0daf418bac7e17c601f46d3bfe54fd0ae' 
  AND token = 'yeT4SafpdRr6mIw8M76Bw+x6zlKnqM8Nx37jlA+V51E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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