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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37af361b07dba7afe166522d50e74b11a640a30d5227b5baedb014b3328f7e1f' 
  AND token = 'bR2s1wFvRoL12xAYRNsUcW6VqzwGJi0lD9H3QYuY3Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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