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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0098edcf4aab31e240eb85c3f0d86003c99c29fc3a47cfc90f8a5374c735df' 
  AND token = '0kRkznF7ZwO2dgFJBFlawzpxGLwSBhtsrmwrODUZKcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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