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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cfd9d39406aa494560643f7a5f64b797c70b343925c096f7f5b9cf797a0d1b' 
  AND token = 'uoRA3Fr0/yzAz56yZPwF2ZWaBrN9iFLLuVlAX3ve9RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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