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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b800c5897e7522c12aabbf98a685a1e8fbe92689bb4f3dae1eb7489147d858' 
  AND token = '1+nexXZDFpHyF/bjc7tryz2+EfsT4W6GzyXMMCUcStA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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