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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed08f8e15c193ebc901564322bef85dc5ba0134b63c95e0b50e62290789ae9de' 
  AND token = 'TC+TLYWElwPho1jMZNox0p+jfV9EiXdhJt8ZbmWAvEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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