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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2ea92f5049ec79a9d758d59f467f6d4cdb6c76aee79c4de4db31153b2df677' 
  AND token = 'RsZeyvb6++TfM2G+owx0n2XRM/QF+WXcKFuU71iOvjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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