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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463c64e7a40b11a9c61417152bf0eb0ad0400bd78f9810a311aa452b8b15bb7d' 
  AND token = 'FCzj+k39koru5Uce2+Nz1zC9DkeCZOz0y4MoQupzo7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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