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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe3af4c32271c92327ffa9723ab1272393ea58bd34bf09cb6d40fc13623cc56' 
  AND token = 'kjUvluMdREBbYpdglGBss0l1Y69/dZDxsyb9hpqfWbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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