SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5336f23cd0e8b9b59a643117b02e93d46dfb2edf17d34973241aff927984bebd' 
  AND token = 'nHnHrtxcEe+VphU5nzEFHp/DNaTg8Ijvg+R+KJlbrOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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