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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac481520dff26da3a47db24d05089beb50feee2757500ac5cb545eca3c6088d' 
  AND token = '741sKmARuw+6kiBSAiUXZTc9J6pnsqd7rqdk/BRsGIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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