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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b40b801d79ba3164a9fed65eba6da12d7426d70b3943b92c4a5cce430547d42' 
  AND token = 'Oc89J+PqeERwR+KHIa/QU329v/QbaLqC3muAKEM2LRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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