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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6857019f860dd5961a98d5fa9074fdba945ec84eace5fa8e9badb536732b59' 
  AND token = 'DBf08ogcEf2KCZYjN6zYNv32EKlIFu0IBQdX5HJwN6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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