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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7234a65cc96f7ca135b731d5203641290b27f8068ab1647e1104d34d6b9dd2e9' 
  AND token = 'dLLTiXj5wFX6STukh4gQ1fiQZOdkKahD+96KrJv5fWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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