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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90f2950a3d7ccdc78f65940badd80a17d03a1d14bbe5b5135b9217aef7baa67' 
  AND token = 'DAttjrN+hmPGA9fbq6y98Owg3njQs3eJKXT9/O3xiUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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