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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99d7f66c9d11901308daad406f6aa7dc110b5e0a0679a9ac8a9e550a74d2743' 
  AND token = 'wzmJfHbYhx5XPKpNd5sd4eiztE1f7viVTt27/zNGlEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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