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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33f7ea68f46a77d9f8fb92d4266114341a8e3acfeda86dd198cf1849c48ec55' 
  AND token = '1WhpY3acCJFCotDgVcwZl6rfKHhTIHUmI5/HJ3ub9iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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