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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86156ca0df72edf2ae6998c3a8354aac5d441b6558fa71c1fe355fcf67b8a19a' 
  AND token = 'NV6Uq6k2yWM53RtalacFL/2sKC9zQvU9YIJwAUCXiiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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