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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae5ecf2e69ce481411b3f8bca97ddf7c8416541180ae030dfefb63ab6c15cad' 
  AND token = 'Fqrv1SWGwHs+yuyDw17Fwc+hN60mXstopoB/3QWfg+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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