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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8009f1e489cb560fdae9bb79fbcc226a54d2253e7b3406bdbc0f0a66b7998a' 
  AND token = 'ccBr6WjnbLyFb/K39qCbRebAEc9OKyH7IGBc/j7LTug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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