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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6928c2753160c09956c7e5e4cd69b5ba9d15d0ea8c0565ff576538257079560e' 
  AND token = '8vs+An0kSrTa9xtXez5Qf0eJ0lGefZzKANRGZa8YHGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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