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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48670b62b294257fa363486fe451d97dcece410256a8384f8852cd5a50f1a259' 
  AND token = 'yuK8WvZlT1cMX0SvIwupfF19T1WAC3MbMF9yKqZXULI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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