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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586354eaac2f1334e890fa965f16ae840b7eb822a39f0bbc28ba0aa55455b6aa' 
  AND token = 'Zaa4BzYRAoLvVU+3s42t86mR/HUYd/PmFJ7ByoIfJio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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