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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe711b53588cf721c4b86aea7535b5f4c6beee06b501df144a9d70db95cbce93' 
  AND token = 'qjFlIAC5a4aNCBX4wOG5sr6vk3S0ZVquhvi1t1VbDBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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