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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57c7075d8c89fb966aca1c4623c70e613501f731205fbb3a9c0645e696346d5' 
  AND token = 'mm9BKMqETF6IjskygcZBpC33eecS3mZrCI9mEIG2owM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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