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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1cbe8f7af42e4fef016e12a1751e3372d3da3924976cc88f808cceba2bbd73' 
  AND token = 'zrUKh9RcRzyTJgvE762GU00NfKsQYo2s2b/A/Kbok7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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