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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8572530167531f17d9400b9967d6e484a322929ecfb25440b2d7a6f2ed0b893' 
  AND token = 'yyN4rCdjPq97TmykhPSiNGcSLAvGtQAmAHNA70HUt5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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