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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcb71f6ae4ad0a64cb17190f6f9ca198277e8056599d8df94eed82609c1d2b6' 
  AND token = 'WgYQbJRxiEJIDyncIMwBzPrr1yi/zYKmgWWgee3R/Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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