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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce89225f4923d26475feb952eed19f6b785811687b7e91a8ce1826f7cdf9365' 
  AND token = '8jlImMyY2DF54GPRvLDGEX3JUhdLXj8yF+PX3bppQoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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