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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7661e87ad7d13ce88f9176cf0bc8dd49bc3756d12276bd9fccc29b8c26d04b0c' 
  AND token = 'AK3gJH/+THM+XRlAexWCh7JAuJlm3h4d7vehMGCKYkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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