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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d23c0a82f771acfdca553a7d5618f53512c28cc3389690aff40b3e979bca48' 
  AND token = 'GG2lUd5wilqfAJ8rYHi3u9E8rS2zCx4EkW+EkES9V50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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