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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608636e7c7b094db9d977fd0cd08e56a3bd5094ecc485a5a37855a8e135e08c2' 
  AND token = 'NC3v7TMPFdS4rD4yN9pQBpYhyLun1KppONvooD3IdhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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