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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f35fbf514dc6bfe19be5ab7f73c412ebd09e699c0d29e973adad0d48193a5a' 
  AND token = 'k9NT1XsLBYcnELuk148mZTmzfW9yi+S3iZZb6sAhD7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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