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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98fe9d1be7ae5a84b45724705ac34ac59688da97068b0da0641e8866dd3ef4e' 
  AND token = 'k1m+ZKgkp0YAzDY1tFbAAVCsYxNu3taxBS609PoAwCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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