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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be51e7d741b26081f99bca2212c0dbce60ecf35cc8ed25b6f6150f474da6e1b' 
  AND token = 'MWbgif4YIV1t3KIrBg7YxqMq9aIqCjaBoaXqRQLGbDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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