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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd888a8129eba82a9f5bd2de195fc3f73ddb079f21a3054aef440f632f9ba2b' 
  AND token = '/3JoeCPkivyaGcU09u5e7TpVxmbut2ymHVQVtIXN6Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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