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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5ba576da8b916543d73b32293563602f56577fe59b1d48cb9ee175cc9dc269' 
  AND token = 'juM2t2JOIUXOfgtJvOHoe5/X809km2GP4Sx0mGTWYcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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