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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aad8a11c43ea50960bf16d9dd7847ed1685da9c51734f39002489dc1a22a3b7' 
  AND token = '1KnwCBGWQNbfXaQRTDgB/EatyzCVWI97qFu+Hr4o9cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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