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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6577ed7525dc74c90a84ac7141b6970e28b944f191b379509dc17bd79da5f97a' 
  AND token = 'qCmMhztKt2eF3UBe9+QoKyWG8TZo0GW0LykSEFQy6VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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