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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adecae6ba69cba6bfc337f247f356c69ee3fb4da3239fd9293300751ba3f01a4' 
  AND token = 'a7SEGfEjI4N/c9Nec8Gf/7sJV413mBQzjsyfVPYTS0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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