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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c8dd2bc273865f94658ae5761b0fc25f0351fb95e454a0b338559d61f65962' 
  AND token = 'LjEDxSuk2Cp0hWMmeFyWayNBXs2BAQ7ruchd1rGKqxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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