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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b5cf0e3ba80407df4ba620ddeb2051a723876c168ce71a3f3da2f6cb1580ff' 
  AND token = '1QziWJydaDH98Ht984CguEDqNrsFw+HMkZSjRwIDF3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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