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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3ab12c7528a3e2736f21ba602b933c5dd48beabe9f3ccc2670a87649c56fd6' 
  AND token = '/BEHXSnIdHCarmF75xENe7I7e9RzRSnRXyCrRjdarFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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