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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e176a6e92f9925f3f59e893c682b021ca08a6843c4ee05a5cf758fdfb9de65ad' 
  AND token = 'MOoWQ81t52nK21dM8EWcO0GhIzvUBD8A63iwTYU1YvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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